[Bug]: Access method hypercore crashed server

[langpavel]

What type of bug is this?

Crash

What subsystems and features are affected?

Query executor

What happened?

When I enabled hypercore access method on table with jsonb column, some operations started failing:

• ✅ EXPLAIN (ANALYZE) SELECT * FROM ... -- works
• 💣 EXPLAIN (ANALYZE, SERIALIZE TEXT) SELECT * FROM ... -- crash
• 💣 VACUUM FULL -- crash

Table have jsonb field, so may be this?

ALTER TABLE _timescaledb_internal._hyper_9_28_chunk SET ACCESS METHOD hypercore;

ALTER TABLE
Time: 186,894 ms

EXPLAIN (analyze,verbose,buffers,serialize binary) SELECT * from device_data.raw_zigbee;

server closed the connection unexpectedly
	This probably means the server terminated abnormally
	before or while processing the request.
The connection to the server was lost. Attempting reset: Failed.
The connection to the server was lost. Attempting reset: Failed.

TimescaleDB version affected

2.19.3

PostgreSQL version used

17.4

What operating system did you use?

PostgreSQL 17.4 (Ubuntu 17.4-1.pgdg24.04+2) on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0, 64-bit

What installation method did you use?

Docker, Deb/Apt

What platform did you run on?

On prem/Self-hosted

Relevant log output and stack trace

2025-05-07 12:26:59.863 UTC [1007221] LOG:  checkpoint starting: wal
realloc(): invalid next size
2025-05-07 12:27:43.739 UTC [1708] LOG:  server process (PID 1009258) was terminated by signal 6: Aborted
2025-05-07 12:27:43.739 UTC [1708] DETAIL:  Failed process was running: VACUUM FULL;
2025-05-07 12:27:43.739 UTC [1708] LOG:  terminating any other active server processes
2025-05-07 12:27:43.741 UTC [1024851] admin@customer FATAL:  the database system is in recovery mode
2025-05-07 12:27:43.909 UTC [1708] LOG:  all server processes terminated; reinitializing
2025-05-07 12:27:43.911 UTC [1708] LOG:  [pg_stat_monitor] pgsm_shmem_shutdown: Shutdown initiated.
2025-05-07 12:27:44.856 UTC [1024937] LOG:  database system was interrupted; last known up at 2025-05-07 12:26:11 UTC
2025-05-07 12:27:55.753 UTC [1024937] LOG:  database system was not properly shut down; automatic recovery in progress
2025-05-07 12:27:55.819 UTC [1024937] LOG:  redo starts at 2/9BCD8470
2025-05-07 12:27:59.926 UTC [1024937] LOG:  invalid magic number 0000 in WAL segment 0000000100000002000000E5, LSN 2/E5D00000, offset 13631488
2025-05-07 12:27:59.926 UTC [1024937] LOG:  redo done at 2/E5CFFF68 system usage: CPU: user: 0.86 s, system: 1.18 s, elapsed: 4.10 s
2025-05-07 12:28:00.735 UTC [1024938] LOG:  checkpoint starting: end-of-recovery immediate wait
2025-05-07 12:28:27.871 UTC [1024938] LOG:  checkpoint complete: wrote 157486 buffers (30.0%); 0 WAL file(s) added, 12 removed, 62 recycled; write=19.220 s, sync=2.766 s, total=27.203 s; sync files=460, longest=0.773 s, average=0.007 s; distance=1212574 kB, estimate=1212574 kB; lsn=2/E5D00048, redo lsn=2/E5D00048
2025-05-07 12:28:27.993 UTC [1708] LOG:  database system is ready to accept connections
2025-05-07 12:28:27.994 UTC [1026041] LOG:  TimescaleDB background worker launcher connected to shared catalogs
2025-05-07 12:28:28.001 UTC [1026040] LOG:  pg_cron scheduler started
realloc(): invalid next size
2025-05-07 12:29:50.454 UTC [1708] LOG:  server process (PID 1026103) was terminated by signal 6: Aborted
2025-05-07 12:29:50.454 UTC [1708] DETAIL:  Failed process was running: explain (analyze,verbose,buffers,serialize text) SELECT * from raw_zigbee;
2025-05-07 12:29:50.454 UTC [1708] LOG:  terminating any other active server processes
2025-05-07 12:29:50.456 UTC [1028340] admin@customer FATAL:  the database system is in recovery mode
2025-05-07 12:29:50.532 UTC [1708] LOG:  all server processes terminated; reinitializing
2025-05-07 12:29:50.533 UTC [1708] LOG:  [pg_stat_monitor] pgsm_shmem_shutdown: Shutdown initiated.
2025-05-07 12:29:51.527 UTC [1028353] LOG:  database system was interrupted; last known up at 2025-05-07 12:28:27 UTC
2025-05-07 12:29:52.717 UTC [1028353] LOG:  database system was not properly shut down; automatic recovery in progress
2025-05-07 12:29:52.744 UTC [1028353] LOG:  redo starts at 2/E5D000C0
2025-05-07 12:29:52.744 UTC [1028353] LOG:  invalid record length at 2/E5D02378: expected at least 24, got 0
2025-05-07 12:29:52.744 UTC [1028353] LOG:  redo done at 2/E5D02340 system usage: CPU: user: 0.00 s, system: 0.00 s, elapsed: 0.00 s
2025-05-07 12:29:52.953 UTC [1028354] LOG:  checkpoint starting: end-of-recovery immediate wait
2025-05-07 12:29:53.257 UTC [1028354] LOG:  checkpoint complete: wrote 5 buffers (0.0%); 0 WAL file(s) added, 0 removed, 0 recycled; write=0.071 s, sync=0.095 s, total=0.336 s; sync files=6, longest=0.046 s, average=0.016 s; distance=8 kB, estimate=8 kB; lsn=2/E5D02378, redo lsn=2/E5D02378
2025-05-07 12:29:53.295 UTC [1708] LOG:  database system is ready to accept connections
2025-05-07 12:29:53.297 UTC [1028380] LOG:  TimescaleDB background worker launcher connected to shared catalogs
2025-05-07 12:29:53.302 UTC [1028379] LOG:  pg_cron scheduler started
realloc(): invalid next size
2025-05-07 12:31:38.879 UTC [1708] LOG:  server process (PID 1029056) was terminated by signal 6: Aborted
2025-05-07 12:31:38.879 UTC [1708] DETAIL:  Failed process was running: explain (analyze,verbose,buffers,serialize binary) SELECT * from device_data.raw_zigbee;
2025-05-07 12:31:38.879 UTC [1708] LOG:  terminating any other active server processes
2025-05-07 12:31:38.881 UTC [1031198] admin@customer FATAL:  the database system is in recovery mode
2025-05-07 12:31:38.883 UTC [1708] LOG:  all server processes terminated; reinitializing
2025-05-07 12:31:38.884 UTC [1708] LOG:  [pg_stat_monitor] pgsm_shmem_shutdown: Shutdown initiated.
2025-05-07 12:31:39.393 UTC [1031199] LOG:  database system was interrupted; last known up at 2025-05-07 12:29:53 UTC
2025-05-07 12:31:40.532 UTC [1031199] LOG:  database system was not properly shut down; automatic recovery in progress
2025-05-07 12:31:40.561 UTC [1031199] LOG:  redo starts at 2/E5D023F0
2025-05-07 12:31:40.562 UTC [1031199] LOG:  invalid record length at 2/E5D02428: expected at least 24, got 0
2025-05-07 12:31:40.562 UTC [1031199] LOG:  redo done at 2/E5D023F0 system usage: CPU: user: 0.00 s, system: 0.00 s, elapsed: 0.00 s
2025-05-07 12:31:40.728 UTC [1031200] LOG:  checkpoint starting: end-of-recovery immediate wait
2025-05-07 12:31:41.012 UTC [1031200] LOG:  checkpoint complete: wrote 2 buffers (0.0%); 0 WAL file(s) added, 0 removed, 0 recycled; write=0.070 s, sync=0.052 s, total=0.316 s; sync files=3, longest=0.020 s, average=0.018 s; distance=0 kB, estimate=0 kB; lsn=2/E5D02428, redo lsn=2/E5D02428
2025-05-07 12:31:41.049 UTC [1708] LOG:  database system is ready to accept connections
2025-05-07 12:31:41.050 UTC [1031327] LOG:  TimescaleDB background worker launcher connected to shared catalogs
2025-05-07 12:31:41.054 UTC [1031326] LOG:  pg_cron scheduler started
2025-05-07 12:33:14.543 UTC [1031200] LOG:  checkpoint starting: wal
2025-05-07 12:36:37.498 UTC [1031200] LOG:  checkpoint complete: wrote 63852 buffers (12.2%); 0 WAL file(s) added, 0 removed, 33 recycled; write=200.724 s, sync=0.990 s, total=202.956 s; sync files=114, longest=0.646 s, average=0.009 s; distance=531810 kB, estimate=531810 kB; lsn=3/2078F2E8, redo lsn=3/645ACA8
2025-05-07 12:36:37.499 UTC [1031200] LOG:  checkpoint starting: immediate force wait
2025-05-07 12:36:49.759 UTC [1031200] LOG:  checkpoint complete: wrote 99104 buffers (18.9%); 0 WAL file(s) added, 0 removed, 26 recycled; write=10.965 s, sync=0.291 s, total=12.261 s; sync files=80, longest=0.164 s, average=0.004 s; distance=429265 kB, estimate=521555 kB; lsn=3/2078F3F0, redo lsn=3/2078F360
2025-05-07 12:38:19.310 UTC [1031200] LOG:  checkpoint starting: immediate force wait
2025-05-07 12:38:20.423 UTC [1031200] LOG:  checkpoint complete: wrote 3708 buffers (0.7%); 0 WAL file(s) added, 2 removed, 0 recycled; write=0.463 s, sync=0.381 s, total=1.114 s; sync files=81, longest=0.233 s, average=0.005 s; distance=28920 kB, estimate=472292 kB; lsn=3/223CD470, redo lsn=3/223CD418
2025-05-07 12:39:10.340 UTC [1031402] admin@customer ERROR:  function hypertable_columnstore_stat(unknown) does not exist at character 15
2025-05-07 12:39:10.340 UTC [1031402] admin@customer HINT:  No function matches the given name and argument types. You might need to add explicit type casts.
2025-05-07 12:39:10.340 UTC [1031402] admin@customer STATEMENT:  SELECT * FROM hypertable_columnstore_stat('device_data.raw_zigbee');
2025-05-07 12:39:38.944 UTC [1031200] LOG:  checkpoint starting: immediate force wait
2025-05-07 12:39:39.137 UTC [1031200] LOG:  checkpoint complete: wrote 2 buffers (0.0%); 0 WAL file(s) added, 0 removed, 0 recycled; write=0.006 s, sync=0.027 s, total=0.194 s; sync files=2, longest=0.026 s, average=0.014 s; distance=0 kB, estimate=425062 kB; lsn=3/223CD578, redo lsn=3/223CD520

How can we reproduce the bug?

CREATE TABLE device_data.raw_zigbee (
  created timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP,
  ts timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP,
  routing_key text NOT NULL,
  data jsonb
);

SELECT * FROM timescale.create_hypertable(
  'device_data.raw_zigbee',
  timescale.by_range('created')
);

ALTER TABLE device_data.raw_zigbee SET (
  timescaledb.enable_columnstore,
  timescaledb.orderby = 'created DESC',
  timescaledb.segmentby = 'routing_key'
);

CALL timescale.add_columnstore_policy(
   'device_data.raw_zigbee',
   interval '1 day',
   hypercore_use_access_method => false, -- do not use hypercore access method, crashes DB!
   initial_start => (CURRENT_DATE + INTERVAL '1 hour')::timestamptz
);


then add some data and run the job.

[mkindahl]

@langpavel Thank you for the bug report.

Following your instructions, and using the schema you set up above, I cannot reproduce the bug. See my attempt last.

Since you have a signal 6 in the log, I assumed this is a debug build and it is an assert that fires, so I ran this on a debug build of the server.

Do you have a stack trace that you can add to the issue?

Do you have a more complete example, especially with some more data?

Can you reproduce the crash without the policy? What are the exact steps you do?

mats=# \ir ../issue-8069.sql
CREATE SCHEMA
CREATE TABLE
 hypertable_id | created 
---------------+---------
             1 | t
(1 row)

ALTER TABLE
CALL
mats=# insert into device_data.raw_zigbee values
   (now(), now(), 'magic', '{"foo": "bar"}');
INSERT 0 1
mats=# vacuum full;
VACUUM
mats=# \d device_data.zi

mats=# \d+ device_data.raw_zigbee
                                                     Table "device_data.raw_zigbee"
   Column    |           Type           | Collation | Nullable |      Default      | Storage  | Compression | Stats target | Description 
-------------+--------------------------+-----------+----------+-------------------+----------+-------------+--------------+-------------
 created     | timestamp with time zone |           | not null | CURRENT_TIMESTAMP | plain    |             |              | 
 ts          | timestamp with time zone |           | not null | CURRENT_TIMESTAMP | plain    |             |              | 
 routing_key | text                     |           | not null |                   | extended |             |              | 
 data        | jsonb                    |           |          |                   | extended |             |              | 
Indexes:
    "raw_zigbee_created_idx" btree (created DESC)
Triggers:
    ts_insert_blocker BEFORE INSERT ON device_data.raw_zigbee FOR EACH ROW EXECUTE FUNCTION _timescaledb_functions.insert_blocker()
Child tables: _timescaledb_internal._hyper_1_1_chunk
Access method: heap

mats=# ALTER TABLE _timescaledb_internal._hyper_1_1_chunk SET ACCESS METHOD hypercore;
ALTER TABLE
mats=# EXPLAIN (analyze,verbose,buffers,serialize binary) SELECT * from device_data.raw_zigbee;
                                                                    QUERY PLAN                                                                     
---------------------------------------------------------------------------------------------------------------------------------------------------
 Custom Scan (ColumnarScan) on _timescaledb_internal._hyper_1_1_chunk  (cost=0.00..0.91 rows=1 width=80) (actual time=0.022..0.026 rows=1 loops=1)
   Output: _hyper_1_1_chunk.created, _hyper_1_1_chunk.ts, _hyper_1_1_chunk.routing_key, _hyper_1_1_chunk.data
   Buffers: shared hit=1
 Planning:
   Buffers: shared hit=129 read=2
 Planning Time: 1.164 ms
 Serialization: time=0.031 ms  output=1kB  format=binary
 Execution Time: 0.150 ms
(8 rows)

mats=# VACUUM FULL device_data.raw_zigbee ;
VACUUM
mats=# VACUUM FULL _timescaledb_internal._hyper_1_1_chunk ;
VACUUM
mats=# EXPLAIN (analyze,verbose,buffers,serialize text) SELECT * from device_data.raw_zigbee;
                                                                    QUERY PLAN                                                                     
---------------------------------------------------------------------------------------------------------------------------------------------------
 Custom Scan (ColumnarScan) on _timescaledb_internal._hyper_1_1_chunk  (cost=0.00..0.91 rows=1 width=80) (actual time=0.023..0.028 rows=1 loops=1)
   Output: _hyper_1_1_chunk.created, _hyper_1_1_chunk.ts, _hyper_1_1_chunk.routing_key, _hyper_1_1_chunk.data
   Buffers: shared hit=1
 Planning:
   Buffers: shared hit=66 read=2
 Planning Time: 1.012 ms
 Serialization: time=0.037 ms  output=1kB  format=text
 Execution Time: 0.152 ms
(8 rows)

[wexder]

@mkindahl here's the full sql to reproduce the issue. It ssems there some issue with the long json, shorter json values seems to be working fine.

This sql create both schema and fills it with data. Last line in the script crashes.

CREATE TABLE data_table (
  created timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP,
  key text NOT NULL,
  data jsonb
);

SELECT * FROM create_hypertable(
  'data_table',
  by_range('created', INTERVAL '1 day')
);

ALTER TABLE data_table SET (
  timescaledb.enable_columnstore,
  timescaledb.orderby = 'created DESC',
  timescaledb.segmentby = 'key'
);


CALL add_columnstore_policy(
   'data_table',
   interval '1 hour',
   hypercore_use_access_method => true
);

INSERT INTO data_table (created, key, data) SELECT generate_series('2008-03-01 00:00'::timestamp, '2008-03-01 02:00', '1 second'),upper(substr(md5(random()::text), 1, 25)),'{"previous":[{"table":{"sunlight":"caught","claws":[true,true,1948530175,834199983,{"constantly":{"cook":[true,1599186437,[true,false,{"train":{"without":421607875,"did":690200192,"judge":1342033939,"struggle":"soil","slabs":"straight","means":285298785.9877777,"tonight":"map","appropriate":"someone","human":false,"stuck":-1574401003.8890548,"cat":-2020208975.976814,"sail":1105130398.8894536,"plant":false,"evidence":true,"development":1221443317.5676353,"ball":1631100910,"explain":false,"unusual":"run","top":-1328023503.570065,"idea":false,"string":1456544504.8625677,"memory":false,"belong":false,"free":"column","she":"origin","audience":false,"wrapped":1189915142,"rapidly":1649580310,"harder":1552306742,"stock":"scale","calm":false,"aside":true,"salmon":true,"may":false,"additional":"frog","must":"surprise","meat":"grain","let":1533485764,"sign":true,"pride":"sunlight","early":"shake","won":false,"type":true,"shoot":954009453,"author":false,"speed":-10519149.675128937,"clock":true,"taste":false,"quiet":785640273,"empty":true,"sets":true,"husband":false,"position":2132232064.199218,"short":true,"scientist":"mighty","live":"burst","done":-541881790,"prize":-1860675328,"ever":"close","send":"straight","pink":true,"stream":true,"speak":false,"occur":"alike","blue":true,"steep":false,"best":734514569,"excited":-782890716,"instead":"while","sink":923743102.3101234,"trip":"corner","forth":true,"sleep":false,"famous":"apple","fix":571059650,"funny":"teach","lungs":false,"rush":true,"sitting":"copy","several":false,"setting":false,"flat":"color","bet":false,"exact":false,"rate":false,"sense":"here","quickly":false,"drawn":"classroom","combine":651385598.892257,"young":"century","related":true,"quietly":"torn","parallel":"cool","muscle":566950595.7887475,"heavy":-1562093419,"pleasure":true,"rubbed":"season","failed":1885185130.1911619,"iron":true,"journey":"exactly","smell":true,"village":886658068.7526641,"practice":739699137,"television":true,"vessels":true,"collect":"speech","snow":293308266.68314123,"wrong":true,"unknown":-800938266,"military":true,"manufacturing":2036657547,"throw":"another","perfect":1181490506,"mistake":true,"sport":"law","fight":868082081.9787331,"nuts":-420396212.5695393,"deer":false,"pocket":"rhyme","happy":true,"experience":true,"your":1645215320.5636787,"flower":true,"select":"root","rather":-1330316118,"older":2043854337,"around":-243540683,"mouse":true,"wave":true,"crop":true,"principle":"hour","cost":"split","orange":false,"storm":"guide","black":"pole","corner":true,"fellow":"behavior","good":false,"bean":true,"arm":"thou","store":true,"will":true,"bush":"come","forgotten":"stomach","law":"loss","worried":-992400950.1747735,"wire":true,"noun":-1734211048.8594346,"help":"behavior","location":true,"alive":"using","central":"both","valuable":"doing","near":"thee","affect":false,"treated":false,"wonder":"paragraph","tax":false,"dance":915285406,"hunter":"last","exchange":"since","task":681187483,"teeth":"children","make":false,"surrounded":-1427168187.3640828,"community":1557367355,"charge":-750613770.681623,"brass":"union","wore":525921138,"mean":false,"possibly":"parallel","spirit":"nose","ill":"from","because":true,"such":false,"shake":false,"everything":2102859516.8466384,"buy":false,"fifty":"previous","exist":true,"design":648645344.5283728,"explanation":false,"standard":513793674.3554733,"graph":false,"package":-1680198757,"return":919262690,"bright":"interest","college":1639117963.791036,"dark":"paint","feel":false,"image":true,"knew":-391768658,"inch":"balance","began":"begun","all":false,"guard":-1691131786.4867308,"mixture":"good","brave":"many","wide":"carbon","native":false,"further":true,"heart":-2039138743.0696762,"lift":-803002511,"program":-1159195741.143424,"hold":-941684859.9917223,"imagine":126700678,"stood":"lunch","water":false,"general":317006562.2889428,"real":-109353743,"against":"never","answer":"attached","laugh":false,"bat":true,"course":false,"special":800085684.1742125,"include":true,"buffalo":false,"chair":"allow","darkness":true,"fifth":-2140303497.8712752,"dish":"follow","act":true,"globe":"silent","be":"suddenly","breeze":1814064030,"effect":"such","degree":766064085,"pressure":426382284,"acres":true,"scientific":"shelf","station":1457395477,"printed":-1577529369,"able":true,"sun":-853587339,"southern":"best","consist":1359786442,"season":false,"desert":-593914950,"receive":false,"properly":"tobacco","soon":true,"straw":423411755,"difficult":372552058,"personal":true,"customs":true,"game":true,"improve":false,"animal":552937958,"old":false,"thin":true,"has":"farther","driving":"pitch","slipped":158603400.34802866,"pretty":true,"touch":-224246221.56980085,"correctly":false,"feathers":-979227252,"plural":true,"wet":"bottle","engine":false,"serve":"verb","came":1797302589,"seeing":"attached","roll":"slipped","tent":333391533,"couple":false,"merely":561394767.910281,"stranger":false,"oil":1824350545,"more":1780861917},"religious":"silly","her":-13417256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-- This is IMPORTANT, crash will occur only on compresed chunks
DO $$
DECLARE job INTEGER;
BEGIN
  job := (SELECT job_id FROM timescaledb_information.jobs WHERE proc_name='policy_compression');
  CALL run_job(job);
END $$;


SELECT * FROM chunk_columnstore_stats('data_table');

EXPLAIN (ANALYZE) SELECT * FROM data_table; -- Works
EXPLAIN (ANALYZE, SERIALIZE BINARY) SELECT * FROM data_table; -- Will crash

[mkindahl]

@wexder Thanks for the reproduction case. It cannot be reproduced with a debug build, but a normal release build seems to trigger it. Here is the stack

(gdb) bt
#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:44
#1  __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78
#2  __GI___pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
#3  0x000077e7d124527e in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#4  0x000077e7d12288ff in __GI_abort () at ./stdlib/abort.c:79
#5  0x000077e7d12297b6 in __libc_message_impl (fmt=fmt@entry=0x77e7d13ce8d7 "%s\n") at ../sysdeps/posix/libc_fatal.c:134
#6  0x000077e7d12a8ff5 in malloc_printerr (str=str@entry=0x77e7d13d1d58 "malloc(): invalid size (unsorted)") at ./malloc/malloc.c:5772
#7  0x000077e7d12abb54 in _int_malloc (av=av@entry=0x77e7d1403ac0 <main_arena>, bytes=bytes@entry=65584) at ./malloc/malloc.c:4078
#8  0x000077e7d12ad7f2 in __GI___libc_malloc (bytes=bytes@entry=65584) at ./malloc/malloc.c:3328
#9  0x00005af896bd2805 in AllocSetAllocLarge (context=0x5af89920f440, size=65536, flags=0) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/utils/mmgr/aset.c:715
#10 0x00005af896bd2965 in AllocSetAlloc (context=<optimized out>, size=<optimized out>, flags=<optimized out>) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/utils/mmgr/aset.c:986
#11 0x00005af896bd2a83 in AllocSetRealloc (pointer=0x5af89920fd70, size=65536, flags=0) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/utils/mmgr/aset.c:1392
#12 0x00005af896bff7f1 in repalloc (size=65536, pointer=<optimized out>) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/utils/mmgr/mcxt.c:1565
#13 enlargeStringInfo (str=0x5af89920fd48, needed=<optimized out>) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/common/stringinfo.c:349
#14 0x00005af896ab8494 in JsonbToCStringWorker (out=out@entry=0x5af89920fd48, in=0x5af8991e2384, estimated_len=<optimized out>, indent=indent@entry=false) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/utils/adt/jsonb.c:514
#15 0x00005af896ab8998 in JsonbToCString (estimated_len=<optimized out>, in=<optimized out>, out=0x5af89920fd48) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/utils/adt/jsonb.c:475
#16 jsonb_send (fcinfo=<optimized out>) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/utils/adt/jsonb.c:131
#17 0x00005af8967cae3e in FunctionCall1Coll (arg1=<optimized out>, collation=0, flinfo=0x5af898fb3170) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/utils/fmgr/fmgr.c:1134
#18 SendFunctionCall (val=<optimized out>, flinfo=0x5af898fb3170) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/utils/fmgr/fmgr.c:1746
#19 serializeAnalyzeReceive (slot=0x5af899294d10, self=0x5af8990bb7c8) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/commands/explain.c:5451
#20 0x00005af896842039 in ExecutePlan (dest=0x5af8990bb7c8, direction=<optimized out>, numberTuples=0, sendTuples=true, operation=CMD_SELECT, queryDesc=0x5af899254868) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/executor/execMain.c:1680
#21 standard_ExecutorRun (queryDesc=0x5af899254868, direction=<optimized out>, count=0, execute_once=<optimized out>) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/executor/execMain.c:361
#22 0x00005af8967c9565 in ExecutorRun (execute_once=true, count=0, direction=<optimized out>, queryDesc=0x5af899254868) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/executor/execMain.c:307
#23 ExplainOnePlan (plannedstmt=<optimized out>, into=0x0, es=0x5af898e77090, queryString=<optimized out>, params=<optimized out>, queryEnv=<optimized out>, planduration=<optimized out>, bufusage=<optimized out>, mem_counters=<optimized out>)
    at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/commands/explain.c:702
#24 0x00005af8967c9836 in standard_ExplainOneQuery (query=<optimized out>, cursorOptions=<optimized out>, into=0x0, es=0x5af898e77090, queryString=0x5af898d79c38 "EXPLAIN (ANALYZE, SERIALIZE BINARY) SELECT * FROM data_table;", params=0x0, queryEnv=0x0)
    at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/commands/explain.c:509
#25 0x000077e7c4fb2b84 in explain_decompression (query=<optimized out>, cursorOptions=<optimized out>, into=<optimized out>, es=0x5af898e77090, queryString=<optimized out>, params=<optimized out>, queryEnv=0x0)
    at /home/mats/work/timescale/timescaledb+bugs/tsl/src/hypercore/arrow_cache_explain.c:79
#26 0x00005af8967c9dae in ExplainQuery (pstate=0x5af898e002f0, stmt=0x5af898d7a9e0, params=<optimized out>, dest=0x5af898e76f00) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/commands/explain.c:342
#27 0x00005af896a32772 in standard_ProcessUtility (pstmt=0x5af898d7aa78, queryString=0x5af898d79c38 "EXPLAIN (ANALYZE, SERIALIZE BINARY) SELECT * FROM data_table;", readOnlyTree=<optimized out>, context=PROCESS_UTILITY_TOPLEVEL, params=0x0, queryEnv=0x0, 
    dest=0x5af898e76f00, qc=0x7ffefa044850) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/tcop/utility.c:863
#28 0x000077e7c5164556 in prev_ProcessUtility (args=<optimized out>) at /home/mats/work/timescale/timescaledb+bugs/src/process_utility.c:113
#29 0x000077e7c516dadc in timescaledb_ddl_command_start (pstmt=0x5af898d7aa78, query_string=<optimized out>, readonly_tree=false, context=PROCESS_UTILITY_TOPLEVEL, params=0x0, queryEnv=<optimized out>, dest=0x5af898e76f00, completion_tag=0x7ffefa044850)
    at /home/mats/work/timescale/timescaledb+bugs/src/process_utility.c:5492
#30 0x00005af896a32d01 in ProcessUtility (qc=0x7ffefa044850, dest=0x5af898e76f00, queryEnv=<optimized out>, params=<optimized out>, context=PROCESS_UTILITY_TOPLEVEL, readOnlyTree=<optimized out>, queryString=<optimized out>, pstmt=0x5af898d7aa78)
    at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/tcop/utility.c:519
#31 PortalRunUtility (portal=portal@entry=0x5af898e23ed8, pstmt=0x5af898d7aa78, isTopLevel=isTopLevel@entry=true, setHoldSnapshot=setHoldSnapshot@entry=true, dest=dest@entry=0x5af898e76f00, qc=qc@entry=0x7ffefa044850)
    at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/tcop/pquery.c:1156
#32 0x00005af896a331b9 in FillPortalStore (portal=portal@entry=0x5af898e23ed8, isTopLevel=isTopLevel@entry=true) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/tcop/pquery.c:1029
#33 0x00005af896a335af in PortalRun (portal=0x5af898e23ed8, count=9223372036854775807, isTopLevel=true, run_once=<optimized out>, dest=0x5af898d7b9d8, altdest=0x5af898d7b9d8, qc=0x7ffefa044a40)
    at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/tcop/pquery.c:761
#34 0x00005af896a2cdc1 in exec_simple_query (query_string=0x5af898d79c38 "EXPLAIN (ANALYZE, SERIALIZE BINARY) SELECT * FROM data_table;") at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/tcop/postgres.c:1278
#35 0x00005af896a35304 in PostgresMain (dbname=<optimized out>, username=<optimized out>) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/tcop/postgres.c:4767
#36 0x00005af896a2aeff in BackendMain (startup_data=<optimized out>, startup_data_len=<optimized out>) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/tcop/backend_startup.c:105
#37 0x00005af89698b376 in postmaster_child_launch (child_type=B_BACKEND, startup_data=0x7ffefa044fc0 "", startup_data_len=4, client_sock=0x7ffefa044fe0) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/postmaster/launch_backend.c:277
#38 0x00005af896c24911 in postmaster_child_launch (client_sock=0x7ffefa044fe0, startup_data_len=4, startup_data=0x7ffefa044fc0 "", child_type=B_BACKEND) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/postmaster/postmaster.c:3558
#39 BackendStartup (client_sock=0x7ffefa044fe0) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/postmaster/postmaster.c:3594
#40 ServerLoop.isra.0 () at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/postmaster/postmaster.c:1676
#41 0x00005af896996965 in PostmasterMain (argc=<optimized out>, argv=<optimized out>) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/postmaster/postmaster.c:1374
#42 0x00005af89663cd2d in main (argc=5, argv=0x5af898d38070) at /usr/src/postgresql-17-17.5-1.pgdg24.04+1/build/../src/backend/main/main.c:199

[svenklemm]

Closing this since hypercore access method has been removed